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Svelte implementation of the Carbon Design System

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Quick Overview

Carbon Components Svelte is a Svelte implementation of the Carbon Design System, providing a set of reusable UI components for building web applications. It offers a comprehensive suite of components that adhere to IBM's design guidelines, ensuring consistency and accessibility across projects.

Pros

  • Seamless integration with Svelte projects
  • Comprehensive set of UI components following IBM's Carbon Design System
  • Excellent TypeScript support and type definitions
  • Regular updates and active community support

Cons

  • Limited customization options compared to vanilla CSS implementations
  • Learning curve for developers unfamiliar with Carbon Design System
  • Potential performance overhead for smaller projects that don't need all components

Code Examples

Creating a button:

<script>
  import { Button } from "carbon-components-svelte";
</script>

<Button>Click me</Button>

Using a data table:

<script>
  import { DataTable } from "carbon-components-svelte";
  
  let rows = [
    { id: 1, name: "Alice", age: 30 },
    { id: 2, name: "Bob", age: 25 },
  ];
</script>

<DataTable
  headers={[
    { key: "name", value: "Name" },
    { key: "age", value: "Age" },
  ]}
  {rows}
/>

Implementing a modal:

<script>
  import { Modal, Button } from "carbon-components-svelte";
  let open = false;
</script>

<Button on:click={() => (open = true)}>Open Modal</Button>

<Modal
  bind:open
  modalHeading="Example Modal"
  primaryButtonText="Confirm"
  secondaryButtonText="Cancel"
  on:click:button--secondary={() => (open = false)}
  on:submit={() => {
    // Handle form submission
    open = false;
  }}
>
  <p>Modal content goes here.</p>
</Modal>

Getting Started

  1. Install the package:

    npm install carbon-components-svelte

  2. Import and use components in your Svelte file:

    <script>
import { Button, TextInput } from "carbon-components-svelte";
</script>

<TextInput labelText="Name" placeholder="Enter your name" />
<Button>Submit</Button>

  3. (Optional) Include Carbon styles in your project's entry point:

    import "carbon-components-svelte/css/all.css";

Competitor Comparisons

sveltejs logo

svelte

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Pros of Svelte

  • More lightweight and faster compilation compared to Carbon Components Svelte
  • Greater flexibility and customization options for building user interfaces
  • Larger community and ecosystem, with more resources and third-party libraries available

Cons of Svelte

  • Lacks pre-built UI components specific to IBM's Carbon Design System
  • May require more time to implement complex UI patterns that are already available in Carbon Components Svelte
  • Less opinionated, which can lead to inconsistencies in design and implementation across projects

Code Comparison

Svelte component:

<script>
  export let name = 'World';
</script>

<h1>Hello {name}!</h1>

Carbon Components Svelte component:

<script>
  import { Button } from "carbon-components-svelte";
</script>

<Button>Click me</Button>

The Svelte example shows a basic component with a customizable prop, while the Carbon Components Svelte example demonstrates the use of a pre-built UI component from the Carbon Design System. Carbon Components Svelte provides ready-to-use components that adhere to IBM's design guidelines, while Svelte offers more flexibility but requires manual implementation of UI elements.

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carbon-components-react

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Pros of carbon-components-react

  • Larger community and ecosystem, with more resources and third-party integrations
  • More mature and stable, with a longer development history
  • Extensive documentation and examples available

Cons of carbon-components-react

  • Larger bundle size due to React's overhead
  • Potentially slower performance compared to Svelte's compiled output
  • More complex setup and configuration required

Code Comparison

carbon-components-react:

import { Button } from 'carbon-components-react';

function MyComponent() {
  return <Button>Click me</Button>;
}

carbon-components-svelte:

<script>
  import { Button } from "carbon-components-svelte";
</script>

<Button>Click me</Button>

The Svelte version is more concise and doesn't require a separate function component. It also has a smaller runtime footprint due to Svelte's compilation process.

Both libraries provide Carbon Design System components for their respective frameworks, offering a consistent look and feel. carbon-components-react benefits from React's widespread adoption and extensive ecosystem, while carbon-components-svelte leverages Svelte's simplicity and performance optimizations. The choice between them depends on your project's specific requirements, team expertise, and performance considerations.

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Pros of Tailwind CSS

  • Highly customizable and flexible, allowing for rapid UI development
  • Utility-first approach enables quick styling without leaving HTML
  • Large and active community, with extensive documentation and resources

Cons of Tailwind CSS

  • Steeper learning curve for developers new to utility-first CSS
  • Can lead to longer class strings in HTML, potentially reducing readability
  • Requires additional setup and configuration for optimal use

Code Comparison

Carbon Components Svelte:

<Button>Click me</Button>

Tailwind CSS:

<button class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">
  Click me
</button>

Carbon Components Svelte provides pre-built, styled components that are ready to use out of the box, while Tailwind CSS requires composing utility classes to achieve the desired styling. The Carbon approach results in cleaner HTML but less flexibility, whereas Tailwind offers more customization at the cost of verbose class names.

Both libraries have their strengths and are suited for different project needs. Carbon Components Svelte is ideal for rapid development with a consistent design system, while Tailwind CSS shines in projects requiring high customization and flexibility.

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Pros of Vuetify

  • Larger ecosystem with more components and plugins
  • Extensive documentation and community support
  • Material Design-based, offering a familiar and modern look

Cons of Vuetify

  • Heavier bundle size, potentially impacting performance
  • Less flexibility in customization compared to Carbon Components Svelte
  • Steeper learning curve due to its comprehensive nature

Code Comparison

Carbon Components Svelte:

<script>
  import { Button } from "carbon-components-svelte";
</script>

<Button>Click me</Button>

Vuetify:

<template>
  <v-btn>Click me</v-btn>
</template>

<script>
import { defineComponent } from 'vue'

export default defineComponent({
  // Component logic here
})
</script>

Carbon Components Svelte offers a more straightforward implementation, while Vuetify requires a bit more boilerplate code. However, Vuetify provides more built-in styling options and features out of the box.

Both libraries aim to simplify UI development, but Carbon Components Svelte focuses on IBM's Carbon Design System, while Vuetify adheres to Material Design principles. The choice between them depends on project requirements, design preferences, and the desired level of customization.

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README

carbon-components-svelte

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Carbon Components Svelte is a Svelte component library that implements the Carbon Design System, an open source design system by IBM. Ship accessible, consistent, production-ready interfaces.

  • 70+ components: from inputs to data tables
  • 5 built-in themes: two light, three dark
  • Fully typed TypeScript API: props, events, and slots
  • WCAG 2.1 AA: keyboard and screen-reader ready

The Carbon Svelte ecosystem also includes:

Documentation

Installation

# npm
npm i carbon-components-svelte

# pnpm
pnpm add carbon-components-svelte

# Yarn
yarn add carbon-components-svelte

# Bun
bun add carbon-components-svelte

Usage

Styling

Before importing components, you will need to first apply Carbon component styles. The Carbon Design System supports five themes (2 light, 3 dark).

  • white.css: Default Carbon theme (light)
  • g10.css: Gray 10 theme (light)
  • g80.css: Gray 80 theme (dark)
  • g90.css: Gray 90 theme (dark)
  • g100.css: Gray 100 theme (dark)
  • all.css: All five themes (White, Gray 10, Gray 80, Gray 90, Gray 100) using CSS variables

Each StyleSheet is generated from the flagship carbon-components library.

The compiled CSS is generated from the following .scss files:

Import one theme once at the top-level entry point of your app, like index.js or src/+layout.svelte.

CSS StyleSheet

// White theme
import "carbon-components-svelte/css/white.css";

// Gray 10 theme
import "carbon-components-svelte/css/g10.css";

// Gray 80 theme
import "carbon-components-svelte/css/g80.css";

// Gray 90 theme
import "carbon-components-svelte/css/g90.css";

// Gray 100 theme
import "carbon-components-svelte/css/g100.css";

// All themes
import "carbon-components-svelte/css/all.css";

SCSS

The most performant method to load styles is to import SCSS directly from carbon-components. Although it requires more set up, you can reduce the size of the bundle CSS by importing individual component styles instead of a pre-compiled CSS StyleSheet.

Refer to the official Carbon guide on SASS for documentation.

Dynamic theming

To switch themes at runtime, import the combined "all.css" StyleSheet instead of a single theme. It bundles all five themes and toggles between them through a theme attribute on the HTML element.

import "carbon-components-svelte/css/all.css";

Update the theme by setting the theme attribute on the html element. The default theme is "white".

<!doctype html>
<html lang="en" theme="g10">
  <body>
    ...
  </body>
</html>

Or programmatically switch between each of the five Carbon themes by setting the theme attribute on the HTML element.

<script>
  let theme = "white"; // "white" | "g10" | "g80" | "g90" | "g100"

  $: document.documentElement.setAttribute("theme", theme);
</script>

Alternatively, use the Theme component to manage the theme reactively.

Importing components

Import components from carbon-components-svelte in the script tag of your Svelte file. Visit the documentation site for examples.

<!-- App.svelte -->
<script>
  import { Accordion, AccordionItem } from "carbon-components-svelte";
</script>

<Accordion>
  <AccordionItem title="Section 1" open> Content 1 </AccordionItem>
  <AccordionItem title="Section 2"> Content 2 </AccordionItem>
  <AccordionItem title="Section 3"> Content 3 </AccordionItem>
</Accordion>

Refer to the documentation site for component API documentation.

Preprocessors & Plugins

carbon-preprocess-svelte is a collection of Svelte preprocessors for Carbon. It trims build times and bundle size with two drop-in tools for faster HMR in development and leaner CSS when you ship.

[!NOTE] Using carbon-preprocess-svelte is optional and not a prerequisite for this library. It should be installed as a development dependency.

# npm
npm i -D carbon-preprocess-svelte

# pnpm
pnpm add -D carbon-preprocess-svelte

# Yarn
yarn add -D carbon-preprocess-svelte

# Bun
bun add -D carbon-preprocess-svelte

optimizeImports

optimizeImports is a Svelte preprocessor that rewrites barrel imports from Carbon components/icons/pictograms packages to their source Svelte code paths. This can significantly speed up development and production build compile times while preserving typeahead and autocompletion offered by integrated development environments (IDE) like VS Code.

The preprocessor optimizes imports from the following packages:

Before & After

- import { Button } from "carbon-components-svelte";
+ import Button from "carbon-components-svelte/src/Button/Button.svelte";

- import { Add } from "carbon-icons-svelte";
+ import Add from "carbon-icons-svelte/lib/Add.svelte";

- import { Airplane } from "carbon-pictograms-svelte";
+ import Airplane from "carbon-pictograms-svelte/lib/Airplane.svelte";

optimizeCss

optimizeCss is a Vite plugin that removes unused Carbon styles at build time, often removing hundreds of kilobytes from production bundles. The plugin is compatible with Rollup (Vite extends the Rollup plugin API).

carbon-components-svelte@0.85.0 or greater is required.

$ vite build

Optimized index-CU4gbKFa.css
- Before: 606.26 kB
+ After:   53.22 kB (-91.22%)

dist/index.html                  0.34 kB │ gzip:  0.24 kB
dist/assets/index-CU4gbKFa.css  53.22 kB │ gzip:  6.91 kB
dist/assets/index-Ceijs3eO.js   53.65 kB │ gzip: 15.88 kB

[!NOTE] This is a plugin and not a Svelte preprocessor. It should be added to the list of vite.plugins. For Vite set-ups, this plugin is only run when building the app. For Rollup and Webpack, you should conditionally apply the plugin to only execute when building for production.

Configure your bundler

Add optimizeImports to your Svelte preprocessor and optimizeCss to your bundler plugins. See examples for full configurations.

Vite

// vite.config.js
import { svelte, vitePreprocess } from "@sveltejs/vite-plugin-svelte";
import { optimizeCss, optimizeImports } from "carbon-preprocess-svelte";

export default {
  plugins: [
    svelte({
      preprocess: [vitePreprocess(), optimizeImports()],
    }),
    optimizeCss(),
  ],
};

SvelteKit

// svelte.config.js
import adapter from "@sveltejs/adapter-static";
import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";
import { optimizeImports } from "carbon-preprocess-svelte";

const config = {
  preprocess: [vitePreprocess(), optimizeImports()],
  kit: { adapter: adapter() },
};

export default config;

// vite.config.js
import { sveltekit } from "@sveltejs/kit/vite";
import { optimizeCss } from "carbon-preprocess-svelte";
import { defineConfig } from "vite";

export default defineConfig({
  plugins: [sveltekit(), optimizeCss()],
});

Rollup

// rollup.config.js
import svelte from "rollup-plugin-svelte";
import { optimizeCss, optimizeImports } from "carbon-preprocess-svelte";

const production = !process.env.ROLLUP_WATCH;

export default {
  plugins: [
    svelte({
      preprocess: [optimizeImports()],
    }),
    production && optimizeCss(),
  ],
};

Webpack

// webpack.config.mjs
import { OptimizeCssPlugin, optimizeImports } from "carbon-preprocess-svelte";

export default {
  module: {
    rules: [
      {
        test: /\.svelte$/,
        use: {
          loader: "svelte-loader",
          options: {
            preprocess: [optimizeImports()],
          },
        },
      },
    ],
  },
  plugins: [new OptimizeCssPlugin()],
};

Icons and pictograms

The icon and pictogram sets ship as separate packages of individual Svelte components. Each is optional, so install only what you need.

Icons

2,700+ icons designed for product UI, in four sizes (16, 20, 24, and 32 pixels), set with a single prop.

# npm
npm i carbon-icons-svelte

# pnpm
pnpm add carbon-icons-svelte

# Yarn
yarn add carbon-icons-svelte

# Bun
bun add carbon-icons-svelte

<script>
  import Add from "carbon-icons-svelte/lib/Add.svelte";
</script>

<Add size={24} />

Pictograms

1,500+ illustrative pictograms for empty states, onboarding, hero sections, and feature callouts. Larger than icons, 64px by default.

# npm
npm i carbon-pictograms-svelte

# pnpm
pnpm add carbon-pictograms-svelte

# Yarn
yarn add carbon-pictograms-svelte

# Bun
bun add carbon-pictograms-svelte

<script>
  import Cloud from "carbon-pictograms-svelte/lib/Cloud.svelte";
</script>

<Cloud />

Documentation for LLMs

Documentation is available in LLM-friendly plain text for use with coding assistants, plus a standalone Markdown document for every component. Append .md to any component's URL to read it.

  • llms.txt: a component index where each entry links to its per-component Markdown doc, sized for model context windows.
  • llms-full.txt: the full component documentation in a single plain-text file.

Examples

TypeScript support

TypeScript definitions are generated by sveld.

Contributing

Refer to the Contributing guidelines.

Changelog

License

Apache 2.0

IBM Telemetry IBM Telemetry

This package uses IBM Telemetry to collect de-identified and anonymized metrics data in CI environments. By installing this package as a dependency you are agreeing to telemetry collection. To opt out, see Opting out of IBM Telemetry data collection. For more information on the data being collected, please see the IBM Telemetry documentation.

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